Study of the effect of natural killer cell activity to mice with tumor by means of external qi Author: Liu Defu 1//Shen Xiaoheng 1//Wang Changan 2 Affiliation: Ruijin Hospital affiliated to Shanghai Second Medical University [1] //Shanghai Immunology Research Institute [2] Conference/Journal: 3rd Int Symp on Qigong Date published: 1990 Other: Pages: 73 , Special Notes: p. 70 in Chinese